feat: add View Transitions API hero animation for favicon between pages

The favicon animates from its large position in the WelcomeWorld title
to the smaller header position in PublicNoteListView and PublicNoteListByDidView.

src/components/WelcomeWorld.vue

@@ -14,7 +14,7 @@ const { userInput, repoInput, submit } = useForm()
 <template>
   <div class="welcome-world">
     <h1 class="title is-1">
-      <img src="/favicon.png" alt="Remanso icon" />
+      <img src="/favicon.png" alt="Remanso icon" class="remanso-logo" />
       Remanso
     </h1>
 
@@ -93,6 +93,10 @@ h1 {
   }
 }
 
+.remanso-logo {
+  view-transition-name: remanso-logo;
+}
+
 .welcome-world {
   padding: 1rem;
   margin: auto;